#include "wx/tokenzr.h"
+// debugger helper: this function can be called from a debugger to show what
+// the date really is
+extern const char *wxDumpFont(const wxFont *font)
+{
+ static char buf[256];
+
+ const wxFontWeight weight = font->GetWeight();
+
+ wxString s;
+ s.Printf(wxS("%s-%s-%s-%d-%d"),
+ font->GetFaceName(),
+ weight == wxFONTWEIGHT_NORMAL
+ ? wxT("normal")
+ : weight == wxFONTWEIGHT_BOLD
+ ? wxT("bold")
+ : wxT("light"),
+ font->GetStyle() == wxFONTSTYLE_NORMAL
+ ? wxT("regular")
+ : wxT("italic"),
+ font->GetPointSize(),
+ font->GetEncoding());
+
+ wxStrlcpy(buf, s.mb_str(), WXSIZEOF(buf));
+ return buf;
+}
+
// ============================================================================
// implementation
// ============================================================================
// helper functions
// ----------------------------------------------------------------------------
-static void AdjustFontSize(wxFont& font, wxDC& dc, const wxSize& pixelSize)
+static inline int flags2Style(int flags)
{
- int currentSize = 0;
- int largestGood = 0;
- int smallestBad = 0;
-
- bool initialGoodFound = false;
- bool initialBadFound = false;
-
- // NB: this assignment was separated from the variable definition
- // in order to fix a gcc v3.3.3 compiler crash
- currentSize = font.GetPointSize();
- while (currentSize > 0)
- {
- dc.SetFont(font);
-
- // if currentSize (in points) results in a font that is smaller
- // than required by pixelSize it is considered a good size
- if (dc.GetCharHeight() <= pixelSize.GetHeight() &&
- (!pixelSize.GetWidth() ||
- dc.GetCharWidth() <= pixelSize.GetWidth()))
- {
- largestGood = currentSize;
- initialGoodFound = true;
- }
- else
- {
- smallestBad = currentSize;
- initialBadFound = true;
- }
- if (!initialGoodFound)
- {
- currentSize /= 2;
- }
- else if (!initialBadFound)
- {
- currentSize *= 2;
- }
- else
- {
- int distance = smallestBad - largestGood;
- if (distance == 1)
- break;
-
- currentSize = largestGood + distance / 2;
- }
+ return flags & wxFONTFLAG_ITALIC
+ ? wxFONTSTYLE_ITALIC
+ : flags & wxFONTFLAG_SLANT
+ ? wxFONTSTYLE_SLANT
+ : wxFONTSTYLE_NORMAL;
+}
- font.SetPointSize(currentSize);
- }
+static inline int flags2Weight(int flags)
+{
+ return flags & wxFONTFLAG_LIGHT
+ ? wxFONTWEIGHT_LIGHT
+ : flags & wxFONTFLAG_BOLD
+ ? wxFONTWEIGHT_BOLD
+ : wxFONTWEIGHT_NORMAL;
+}
- if (currentSize != largestGood)
- font.SetPointSize(largestGood);
+static inline bool flags2Underlined(int flags)
+{
+ return (flags & wxFONTFLAG_UNDERLINED) != 0;
}
// ----------------------------------------------------------------------------
// GetDefaultEncoding() should return something != wxFONTENCODING_DEFAULT
// and, besides, using this value here doesn't make any sense
wxCHECK_RET( encoding != wxFONTENCODING_DEFAULT,
- _T("can't set default encoding to wxFONTENCODING_DEFAULT") );
+ wxT("can't set default encoding to wxFONTENCODING_DEFAULT") );
ms_encodingDefault = encoding;
}
/* static */
wxFont *wxFontBase::New(int size,
- int family,
- int style,
- int weight,
+ wxFontFamily family,
+ wxFontStyle style,
+ wxFontWeight weight,
bool underlined,
const wxString& face,
wxFontEncoding encoding)
return new wxFont(size, family, style, weight, underlined, face, encoding);
}
-static inline int flags2Style(int flags)
-{
- return flags & wxFONTFLAG_ITALIC
- ? wxFONTSTYLE_ITALIC
- : flags & wxFONTFLAG_SLANT
- ? wxFONTSTYLE_SLANT
- : wxFONTSTYLE_NORMAL;
-}
-
-static inline int flags2Weight(int flags)
-{
- return flags & wxFONTFLAG_LIGHT
- ? wxFONTWEIGHT_LIGHT
- : flags & wxFONTFLAG_BOLD
- ? wxFONTWEIGHT_BOLD
- : wxFONTWEIGHT_NORMAL;
-}
-
-static inline bool flags2Underlined(int flags)
+/* static */
+wxFont *wxFontBase::New(const wxSize& pixelSize,
+ wxFontFamily family,
+ wxFontStyle style,
+ wxFontWeight weight,
+ bool underlined,
+ const wxString& face,
+ wxFontEncoding encoding)
{
- return (flags & wxFONTFLAG_UNDERLINED) != 0;
+ return new wxFont(pixelSize, family, style, weight, underlined,
+ face, encoding);
}
/* static */
flags2Underlined(flags), face, encoding);
}
-/* static */
-wxFont *wxFontBase::New(const wxSize& pixelSize,
- int family,
- int style,
- int weight,
- bool underlined,
- const wxString& face,
- wxFontEncoding encoding)
-{
-#if defined(__WXMSW__)
- return new wxFont(pixelSize, family, style, weight, underlined,
- face, encoding);
-#else
- wxFont *self = New(10, family, style, weight, underlined, face, encoding);
- wxScreenDC dc;
- AdjustFontSize(*(wxFont *)self, dc, pixelSize);
- return self;
-#endif
-}
-
/* static */
wxFont *wxFontBase::New(const wxSize& pixelSize,
wxFontFamily family,
flags2Underlined(flags), face, encoding);
}
-wxSize wxFontBase::GetPixelSize() const
-{
- wxScreenDC dc;
- dc.SetFont(*(wxFont *)this);
- return wxSize(dc.GetCharWidth(), dc.GetCharHeight());
-}
-
-bool wxFontBase::IsUsingSizeInPixels() const
-{
- return false;
-}
-
-void wxFontBase::SetPixelSize( const wxSize& pixelSize )
-{
- wxScreenDC dc;
- AdjustFontSize(*(wxFont *)this, dc, pixelSize);
-}
-
/* static */
wxFont *wxFontBase::New(const wxNativeFontInfo& info)
{
return GetFamily() == wxFONTFAMILY_TELETYPE;
}
+wxSize wxFontBase::GetPixelSize() const
+{
+ wxScreenDC dc;
+ dc.SetFont(*(wxFont *)this);
+ return wxSize(dc.GetCharWidth(), dc.GetCharHeight());
+}
+
+bool wxFontBase::IsUsingSizeInPixels() const
+{
+ return false;
+}
+
+void wxFontBase::SetPixelSize( const wxSize& pixelSize )
+{
+ wxCHECK_RET( pixelSize.GetWidth() >= 0 && pixelSize.GetHeight() > 0,
+ "Negative values for the pixel size or zero pixel height are not allowed" );
+
+ wxScreenDC dc;
+
+ // NOTE: this algorithm for adjusting the font size is used by all
+ // implementations of wxFont except under wxMSW and wxGTK where
+ // native support to font creation using pixel-size is provided.
+
+ int largestGood = 0;
+ int smallestBad = 0;
+
+ bool initialGoodFound = false;
+ bool initialBadFound = false;
+
+ // NB: this assignment was separated from the variable definition
+ // in order to fix a gcc v3.3.3 compiler crash
+ int currentSize = GetPointSize();
+ while (currentSize > 0)
+ {
+ dc.SetFont(*static_cast<wxFont*>(this));
+
+ // if currentSize (in points) results in a font that is smaller
+ // than required by pixelSize it is considered a good size
+ // NOTE: the pixel size width may be zero
+ if (dc.GetCharHeight() <= pixelSize.GetHeight() &&
+ (pixelSize.GetWidth() == 0 ||
+ dc.GetCharWidth() <= pixelSize.GetWidth()))
+ {
+ largestGood = currentSize;
+ initialGoodFound = true;
+ }
+ else
+ {
+ smallestBad = currentSize;
+ initialBadFound = true;
+ }
+ if (!initialGoodFound)
+ {
+ currentSize /= 2;
+ }
+ else if (!initialBadFound)
+ {
+ currentSize *= 2;
+ }
+ else
+ {
+ int distance = smallestBad - largestGood;
+ if (distance == 1)
+ break;
+
+ currentSize = largestGood + distance / 2;
+ }
+
+ SetPointSize(currentSize);
+ }
+
+ if (currentSize != largestGood)
+ SetPointSize(largestGood);
+}
+
void wxFontBase::DoSetNativeFontInfo(const wxNativeFontInfo& info)
{
#ifdef wxNO_NATIVE_FONTINFO
wxString wxFontBase::GetNativeFontInfoDesc() const
{
+ wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
+
wxString fontDesc;
const wxNativeFontInfo *fontInfo = GetNativeFontInfo();
if ( fontInfo )
wxString wxFontBase::GetNativeFontInfoUserDesc() const
{
+ wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
+
wxString fontDesc;
const wxNativeFontInfo *fontInfo = GetNativeFontInfo();
if ( fontInfo )
return true;
}
- UnRef();
return false;
}
return true;
}
- UnRef();
return false;
}
{
// either it is the same font, i.e. they share the same common data or they
// have different ref datas but still describe the same font
- return GetFontData() == font.GetFontData() ||
+ return IsSameAs(font) ||
(
- Ok() == font.Ok() &&
+ IsOk() == font.IsOk() &&
GetPointSize() == font.GetPointSize() &&
+ // in wxGTK1 GetPixelSize() calls GetInternalFont() which uses
+ // operator==() resulting in infinite recursion so we can't use it
+ // in that port
+#if !defined(__WXGTK__) || defined(__WXGTK20__)
+ GetPixelSize() == font.GetPixelSize() &&
+#endif
GetFamily() == font.GetFamily() &&
GetStyle() == font.GetStyle() &&
GetWeight() == font.GetWeight() &&
);
}
-bool wxFontBase::operator!=(const wxFont& font) const
+wxFontFamily wxFontBase::GetFamily() const
{
- return !(*this == font);
+ wxCHECK_MSG( IsOk(), wxFONTFAMILY_UNKNOWN, wxS("invalid font") );
+
+ // Don't return wxFONTFAMILY_UNKNOWN from here because it prevents the code
+ // like wxFont(size, wxNORMAL_FONT->GetFamily(), ...) from working (see
+ // #12330). This is really just a hack but it allows to keep compatibility
+ // and doesn't really have any bad drawbacks so do this until someone comes
+ // up with a better idea.
+ const wxFontFamily family = DoGetFamily();
+
+ return family == wxFONTFAMILY_UNKNOWN ? wxFONTFAMILY_DEFAULT : family;
}
wxString wxFontBase::GetFamilyString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTFAMILY_DEFAULT", "invalid font" );
switch ( GetFamily() )
{
- case wxDECORATIVE: return wxT("wxDECORATIVE");
- case wxROMAN: return wxT("wxROMAN");
- case wxSCRIPT: return wxT("wxSCRIPT");
- case wxSWISS: return wxT("wxSWISS");
- case wxMODERN: return wxT("wxMODERN");
- case wxTELETYPE: return wxT("wxTELETYPE");
- default: return wxT("wxDEFAULT");
+ case wxFONTFAMILY_DECORATIVE: return "wxFONTFAMILY_DECORATIVE";
+ case wxFONTFAMILY_ROMAN: return "wxFONTFAMILY_ROMAN";
+ case wxFONTFAMILY_SCRIPT: return "wxFONTFAMILY_SCRIPT";
+ case wxFONTFAMILY_SWISS: return "wxFONTFAMILY_SWISS";
+ case wxFONTFAMILY_MODERN: return "wxFONTFAMILY_MODERN";
+ case wxFONTFAMILY_TELETYPE: return "wxFONTFAMILY_TELETYPE";
+ case wxFONTFAMILY_UNKNOWN: return "wxFONTFAMILY_UNKNOWN";
+ default: return "wxFONTFAMILY_DEFAULT";
}
}
wxString wxFontBase::GetStyleString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTSTYLE_DEFAULT", "invalid font" );
switch ( GetStyle() )
{
- case wxNORMAL: return wxT("wxNORMAL");
- case wxSLANT: return wxT("wxSLANT");
- case wxITALIC: return wxT("wxITALIC");
- default: return wxT("wxDEFAULT");
+ case wxFONTSTYLE_NORMAL: return "wxFONTSTYLE_NORMAL";
+ case wxFONTSTYLE_SLANT: return "wxFONTSTYLE_SLANT";
+ case wxFONTSTYLE_ITALIC: return "wxFONTSTYLE_ITALIC";
+ default: return "wxFONTSTYLE_DEFAULT";
}
}
wxString wxFontBase::GetWeightString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTWEIGHT_DEFAULT", "invalid font" );
switch ( GetWeight() )
{
- case wxNORMAL: return wxT("wxNORMAL");
- case wxBOLD: return wxT("wxBOLD");
- case wxLIGHT: return wxT("wxLIGHT");
- default: return wxT("wxDEFAULT");
+ case wxFONTWEIGHT_NORMAL: return "wxFONTWEIGHT_NORMAL";
+ case wxFONTWEIGHT_BOLD: return "wxFONTWEIGHT_BOLD";
+ case wxFONTWEIGHT_LIGHT: return "wxFONTWEIGHT_LIGHT";
+ default: return "wxFONTWEIGHT_DEFAULT";
}
}
-bool wxFontBase::SetFaceName(const wxString &facename)
+bool wxFontBase::SetFaceName(const wxString& facename)
{
+#if wxUSE_FONTENUM
if (!wxFontEnumerator::IsValidFacename(facename))
{
- UnRef(); // make Ok() return false
+ UnRef(); // make IsOk() return false
return false;
}
+#else // !wxUSE_FONTENUM
+ wxUnusedVar(facename);
+#endif // wxUSE_FONTENUM/!wxUSE_FONTENUM
return true;
}
+wxFont& wxFont::MakeBold()
+{
+ SetWeight(wxFONTWEIGHT_BOLD);
+ return *this;
+}
+
+wxFont wxFont::Bold() const
+{
+ wxFont font(*this);
+ font.MakeBold();
+ return font;
+}
+
+wxFont& wxFont::MakeItalic()
+{
+ SetStyle(wxFONTSTYLE_ITALIC);
+ return *this;
+}
+
+wxFont wxFont::Italic() const
+{
+ wxFont font(*this);
+ font.SetStyle(wxFONTSTYLE_ITALIC);
+ return font;
+}
+
+wxFont& wxFont::Scale(float x)
+{
+ SetPointSize(int(x*GetPointSize() + 0.5));
+ return *this;
+}
+
+wxFont wxFont::Scaled(float x) const
+{
+ wxFont font(*this);
+ font.Scale(x);
+ return font;
+}
// ----------------------------------------------------------------------------
// wxNativeFontInfo
// ----------------------------------------------------------------------------
// Up to now, there are no native implementations of this function:
-void wxNativeFontInfo::SetFaceName(const wxArrayString &facenames)
+void wxNativeFontInfo::SetFaceName(const wxArrayString& facenames)
{
+#if wxUSE_FONTENUM
for (size_t i=0; i < facenames.GetCount(); i++)
{
if (wxFontEnumerator::IsValidFacename(facenames[i]))
wxString validfacename = wxFontEnumerator::GetFacenames().Item(0);
wxLogTrace(wxT("font"), wxT("Falling back to '%s'"), validfacename.c_str());
SetFaceName(validfacename);
+#else // !wxUSE_FONTENUM
+ SetFaceName(facenames[0]);
+#endif // wxUSE_FONTENUM/!wxUSE_FONTENUM
}
{
long l;
- wxStringTokenizer tokenizer(s, _T(";"));
+ wxStringTokenizer tokenizer(s, wxT(";"));
wxString token = tokenizer.GetNextToken();
//
{
wxString s;
- s.Printf(_T("%d;%d;%d;%d;%d;%d;%s;%d"),
+ s.Printf(wxT("%d;%d;%d;%d;%d;%d;%s;%d"),
0, // version
pointSize,
family,
// format there anyhow (but there is a well-defined standard for X11 fonts used
// by wxGTK and wxMotif)
-#if defined(wxNO_NATIVE_FONTINFO) || defined(__WXMSW__) || defined (__WXPM__)
+#if defined(wxNO_NATIVE_FONTINFO) || defined(__WXMSW__) || defined (__WXPM__) || defined(__WXOSX__)
wxString wxNativeFontInfo::ToUserString() const
{
switch ( GetWeight() )
{
default:
- wxFAIL_MSG( _T("unknown font weight") );
+ wxFAIL_MSG( wxT("unknown font weight") );
// fall through
case wxFONTWEIGHT_NORMAL:
switch ( GetStyle() )
{
default:
- wxFAIL_MSG( _T("unknown font style") );
+ wxFAIL_MSG( wxT("unknown font style") );
// fall through
case wxFONTSTYLE_NORMAL:
wxString face = GetFaceName();
if ( !face.empty() )
{
- desc << _T(' ') << face;
+ if (face.Contains(' ') || face.Contains(';') || face.Contains(','))
+ {
+ face.Replace("'", "");
+ // eventually remove quote characters: most systems do not
+ // allow them in a facename anyway so this usually does nothing
+
+ // make it possible for FromUserString() function to understand
+ // that the different words which compose this facename are
+ // not different adjectives or other data but rather all parts
+ // of the facename
+ desc << wxT(" '") << face << _("'");
+ }
+ else
+ desc << wxT(' ') << face;
+ }
+ else // no face name specified
+ {
+ // use the family
+ wxString familyStr;
+ switch ( GetFamily() )
+ {
+ case wxFONTFAMILY_DECORATIVE:
+ familyStr = "decorative";
+ break;
+
+ case wxFONTFAMILY_ROMAN:
+ familyStr = "roman";
+ break;
+
+ case wxFONTFAMILY_SCRIPT:
+ familyStr = "script";
+ break;
+
+ case wxFONTFAMILY_SWISS:
+ familyStr = "swiss";
+ break;
+
+ case wxFONTFAMILY_MODERN:
+ familyStr = "modern";
+ break;
+
+ case wxFONTFAMILY_TELETYPE:
+ familyStr = "teletype";
+ break;
+
+ case wxFONTFAMILY_DEFAULT:
+ case wxFONTFAMILY_UNKNOWN:
+ break;
+
+ default:
+ wxFAIL_MSG( "unknown font family" );
+ }
+
+ if ( !familyStr.empty() )
+ desc << " '" << familyStr << " family'";
}
int size = GetPointSize();
if ( size != wxNORMAL_FONT->GetPointSize() )
{
- desc << _T(' ') << size;
+ desc << wxT(' ') << size;
}
#if wxUSE_FONTMAP
wxFontEncoding enc = GetEncoding();
if ( enc != wxFONTENCODING_DEFAULT && enc != wxFONTENCODING_SYSTEM )
{
- desc << _T(' ') << wxFontMapper::GetEncodingName(enc);
+ desc << wxT(' ') << wxFontMapper::GetEncodingName(enc);
}
#endif // wxUSE_FONTMAP
// reset to the default state
Init();
+ // ToUserString() will quote the facename if it contains spaces, commas
+ // or semicolons: we must be able to understand that quoted text is
+ // a single token:
+ wxString toparse(s);
+
// parse a more or less free form string
- //
- // TODO: we should handle at least the quoted facenames
- wxStringTokenizer tokenizer(s, _T(";, "), wxTOKEN_STRTOK);
+ wxStringTokenizer tokenizer(toparse, wxT(";, "), wxTOKEN_STRTOK);
wxString face;
unsigned long size;
- bool weightfound = false, pointsizefound = false, encodingfound = false;
+ bool weightfound = false, pointsizefound = false;
+#if wxUSE_FONTMAP
+ bool encodingfound = false;
+#endif
+ bool insideQuotes = false;
while ( tokenizer.HasMoreTokens() )
{
// normalize it
token.Trim(true).Trim(false).MakeLower();
+ if (insideQuotes)
+ {
+ if (token.StartsWith("'") ||
+ token.EndsWith("'"))
+ {
+ insideQuotes = false;
+
+ // add this last token to the facename:
+ face += " " + token;
+
+ // normalize facename:
+ face = face.Trim(true).Trim(false);
+ face.Replace("'", "");
+
+ continue;
+ }
+ }
+ else
+ {
+ if (token.StartsWith("'"))
+ insideQuotes = true;
+ }
// look for the known tokens
- if ( token == _T("underlined") || token == _("underlined") )
+ if ( insideQuotes )
+ {
+ // only the facename may be quoted:
+ face += " " + token;
+ continue;
+ }
+ if ( token == wxT("underlined") || token == _("underlined") )
{
SetUnderlined(true);
}
- else if ( token == _T("light") || token == _("light") )
+ else if ( token == wxT("light") || token == _("light") )
{
SetWeight(wxFONTWEIGHT_LIGHT);
weightfound = true;
}
- else if ( token == _T("bold") || token == _("bold") )
+ else if ( token == wxT("bold") || token == _("bold") )
{
SetWeight(wxFONTWEIGHT_BOLD);
weightfound = true;
}
- else if ( token == _T("italic") || token == _("italic") )
+ else if ( token == wxT("italic") || token == _("italic") )
{
SetStyle(wxFONTSTYLE_ITALIC);
}
// assume it is the face name
if ( !face.empty() )
{
- face += _T(' ');
+ face += wxT(' ');
}
face += token;
// bar")
if ( !face.empty() )
{
+ wxString familyStr;
+ if ( face.EndsWith(" family", &familyStr) )
+ {
+ // it's not a facename but rather a font family
+ wxFontFamily family;
+ if ( familyStr == "decorative" )
+ family = wxFONTFAMILY_DECORATIVE;
+ else if ( familyStr == "roman" )
+ family = wxFONTFAMILY_ROMAN;
+ else if ( familyStr == "script" )
+ family = wxFONTFAMILY_SCRIPT;
+ else if ( familyStr == "swiss" )
+ family = wxFONTFAMILY_SWISS;
+ else if ( familyStr == "modern" )
+ family = wxFONTFAMILY_MODERN;
+ else if ( familyStr == "teletype" )
+ family = wxFONTFAMILY_TELETYPE;
+ else
+ return false;
+
+ SetFamily(family);
+ }
// NB: the check on the facename is implemented in wxFontBase::SetFaceName
// and not in wxNativeFontInfo::SetFaceName thus we need to explicitely
// call here wxFontEnumerator::IsValidFacename
- if (!wxFontEnumerator::IsValidFacename(face) ||
- !SetFaceName(face))
+ else if (
+#if wxUSE_FONTENUM
+ !wxFontEnumerator::IsValidFacename(face) ||
+#endif // wxUSE_FONTENUM
+ !SetFaceName(face) )
+ {
SetFaceName(wxNORMAL_FONT->GetFaceName());
+ }
+
face.clear();
}
}
// NB: the check on the facename is implemented in wxFontBase::SetFaceName
// and not in wxNativeFontInfo::SetFaceName thus we need to explicitely
// call here wxFontEnumerator::IsValidFacename
- if (!wxFontEnumerator::IsValidFacename(face) ||
- !SetFaceName(face))
- SetFaceName(wxNORMAL_FONT->GetFaceName());
+ if (
+#if wxUSE_FONTENUM
+ !wxFontEnumerator::IsValidFacename(face) ||
+#endif // wxUSE_FONTENUM
+ !SetFaceName(face) )
+ {
+ SetFaceName(wxNORMAL_FONT->GetFaceName());
+ }
}
// set point size to default value if size was not given
}
#endif // generic or wxMSW or wxOS2
+
+
+// wxFont <-> wxString utilities, used by wxConfig
+wxString wxToString(const wxFontBase& font)
+{
+ return font.IsOk() ? font.GetNativeFontInfoDesc()
+ : wxString();
+}
+
+bool wxFromString(const wxString& str, wxFontBase *font)
+{
+ wxCHECK_MSG( font, false, wxT("NULL output parameter") );
+
+ if ( str.empty() )
+ {
+ *font = wxNullFont;
+ return true;
+ }
+
+ return font->SetNativeFontInfo(str);
+}
+
+
projects / wxWidgets.git / blobdiff